Lapping arbor



Fegfl- 1944- v A. J. HACKMAN ETAL- ,34

LAPPING ARBOR Filed July 26, I943 INVENTORS MAN MAN HACK ms ,4 TTOPNEYm0 MM L Wm mM .2 A.

Patented Feb. 8, 1944 LAPPING ARBOR Arthur J. Hackman and Madeline C.Hackman, Grosse Pointe, Mich.

Application July 26, 1943, Serial No. 496,244

3 Claims.

Our invention relates to a new and useful improvement in a lappingarbor. In lapping operations it is customary to use a lap which ismounted on an arbor which serves to support the lap and rotate it. Onetype of lap which is used comprises a cylindrical tube having a spiralslot formed therein. The slot serves as a means for picking up thelapping compound and returning the lapping compound in the lappingoperation. In known methods of applying the lapping compound, it ispractically impossible to obtain uniform distribution of the lappingcompound and to feed the lapping compound during the lapping operation.

The lapping compound usually consists of a mixture of abrasive materialand lubricant and the consistency, of course, may be varied fordifferent types of work. It is an object of the present invention toprovide a lapping arbor so constructed and arranged that the lappingcompound may be delivered through the arbor to the lap even while thelapping operation is being performed.

It is another object of the invention to provide, a combination, a laphaving a slot formed therethrough and a supporting arbor having alongitudinally directed bore communicating through a radial passage withthe slot in the lap to form a passage for delivery of lapping compoundto the lap.

It is another object of the present invention to provide a lapping arborhaving a delivery passage formed therein and communicating with aperipheral distribution groove for effectively delivering the lappingcompound to a lap mounted on the arbor.

Other objects will appear hereinafter.

It is recognized that various modifications and changes may be made inthe detail of structure shown and it is intended that such modificationsand changes shall be embraced within the scope of the appended claims.

Forming a part of this specification is a drawing in which,

Fig. 1 is a side elevational view of the invention,

Fig. 2 is a longitudinal, central, vertical, sectional view of theinvention,

Fig. 3 is an enlarged sectional view taken on line 3-3 of Fig. 2,

Fig. 4 is an enlarged sectional view taken on line 4-4 of Fig. 2,

Fig. 5 is an enlarged sectional view taken on line 55 of Fig. 2.

In the drawing I have illustrated an arbor 9 which may be suitablyattached to a driving machine for rotating the same, one end of thearbor 9 being provided with the internally threaded socket 10 to effectattachment to the driving machine. Formed in this arbor 9, is a bore orpassage ll, opening through the lateral passage l2 into the peripheralgroove l5.

Positioned on the arbor 9, in the usual manner is a cylindrical lap l3,having the spiral slot 14 formed therein, the lap overlying theperipheral groove I5.

The construction is such that the lapping compound may be delivered topassage II outwardly through the passage l2 into the peripheral groove[5 and thus into the spiral slot Hi. This makes possible a continuousdelivery of lapping compound while the mechanism is in operation andassures a uniform distribution. Also, because of the delivery of thecompound in this manner, a speed-up in operation is obtained.

What we claim as new is:

1. A lapping arbor of the class described comprising an elongated bodyhaving a longitudinally directed bore formed therein, proceedinginwardly from one end and closed at the opposite end and communicatingthrough a lateral passage with a peripheral groove formed in said bodyintermediate its ends.

2. In combination, a lapping arbor comprising an elongated body having alongitudinally directed passage formed therein and opening through oneend thereof, and communicating through a lateral opening with theperiphery thereof; and a lap mounted on said body and overlying saidlateral opening and having a compound carrying slot formed therein.

3. In combination, a lapping arbor comprising an elongated body having apassage formed therein proceeding inwardly from one end thereof, andclosed at its opposite end and communicating through a lateral passagewith a peripheral groove formed in said body; and a cylindrical laphaving a spiral slot formed therein, mounted on said body to overliesaid groove.

ARTHUR J. HACKMAN. MADELINE C. HACKMAN.

